JS Encoding and Decoding

时间：2022-06-21 20:34:09
//charator Str to Hex

function strToHex(str) {

    var rs = "";

    for (var i = 0; i < str.length; i++)

        rs = (rs == "" ?"":rs + ",")+ str.charCodeAt(i).toString(16);

    return rs;

}

//Hex to charator Str

function hexToStr(str) {

    var arr = str.split(","),rs="";

    for(var i = 0; i < arr.length; i++)

        rs += String.fromCharCode(arr[i]);

    return rs;

}

function asciiHexToStr(str) {

    var symbols = " !\"#$%&'()*+,-./0123456789:;<=>?@" + "ABCDEFGHIJKLMNOPQRSTUVWXYZ" + "[\\]^_`" + "abcdefghijklmnopqrstuvwxyz" + "{|}~";

    str = str.toLowerCase();

    var hex = "0123456789abcdef";

    var text = "";

    var i = 0;

    for (i = 0; i < str.length; i = i + 2) {

        var char1 = str.charAt(i);

        if (char1 == '') {//分隔符char1== ":";

            i++;

            char1 = str.charAt(i);

        }

        var char2 = str.charAt(i + 1);

        var num1 = hex.indexOf(char1);

        var num2 = hex.indexOf(char2);

        var value = num1 << 4;

        value = value | num2;

        var valueInt = parseInt(value);

        var symbolIndex = valueInt - 32;

        var ch = '?';

        if (symbolIndex >= 0 && value <= 126) {

            ch = symbols.charAt(symbolIndex)

        }

        text += ch;

    }

    return text;

}

function strToAsciiHex(str) {

    var symbols = " !\"#$%&'()*+,-./0123456789:;<=>?@" + "ABCDEFGHIJKLMNOPQRSTUVWXYZ" + "[\\]^_`" + "abcdefghijklmnopqrstuvwxyz" + "{|}~";

    var hexChars = "0123456789abcdef";

    var text = "";

    for (i = 0; i < str.length; i++) {

        var oneChar = str.charAt(i);

        var asciiValue = symbols.indexOf(oneChar) + 32;

        var index1 = asciiValue % 16;

        var index2 = (asciiValue - index1) / 16;

        if (text != "") text += "";//分隔符text += ":";

        text += hexChars.charAt(index2);

        text += hexChars.charAt(index1);

    }

    return text;

}

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